Marquis d



I (NoModel') M. D; L. WIN'DBLL.

ROCK DRILL.v v

No.41992. `mental Jan. 14, .1890.

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'NITED STATES PATENT OFFICE.

MARQUIS D. L. I/VINDELI., OF OORYDON, INDIANA, ASSIGNOR TO I'IIMSELF AND ZACI'IARY T. FUNK, OF SAME PLACE.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 419,392, dated January 14, 1890.

Application filed May 16, 1889. Serial No. 310,973. (No model.)

T all whom t may concern:

Be it known that I, MARQUIS D. L. WIN- DELL, of Corydon, in the county of Harrison and State of Indiana, have invented a new` drawings, forming a part of this specification,

in which similar letters and figures of reference indicate corresponding parts in all the views.

Figure l is a side View of my improved drill, the shaft and shaft-supporting bracket being shown in section and the latch being 2o shown as it appears when adjusted to hold the hammer out of the Way of the operatingcam; and Fig. 2 is a central sectional elevation of the drill-case, the parts therein being shown as they appear when in operative position.

In the drawings, 10 represents a case'that is formed with a side opening a and provided with a bracket 1l, which serves as a bearing for a short shaft 12, that carries a cam 13,

3o preferably a double cam of the form shown best in Fig. 1. To the outer end of the shaft 12 there is connected a flexible shaft 14, said flexible shaft being arranged for connection with a motor. That section of the shaft 14.

3 5 which is adjacent to the case 10 is protected by rubber tubing 15, the tubing being held to place by clamping-rings 16, as shown.

Within the case 10, I mount a hammer 17, through which there is passed a drill-stem 1S,

4o that is held to a plug 19 by set-screws 20, the plug fitting Within the lower end ofthe case, but being prevented from entering the case bodily by a flange b. The hammer is provided with a laterally-extending boss or stud 21,

which rides in a groove c, formed in the case 10, and in connection with the hammer there is arranged a spring 22, which bears against the upper end of j the hammer and against a cap 23, that is fitted to the upper end of the 5o case, said cap being centrally apertured to provide for the passage of the drill-stem.

In order that the plug 19 may be turned step by step when the machine is in operation, I form said plug with a crown-wheel 25, and I provide the cam 13 with studs d., which 55 engage the teeth of the Wheel at each revolution of the cam-shaft.

yFrom the construction 'above described it willbe seen that as the shaft 14. is revolved a rotary motion will be imparted to the cam 13, 6o and as said cam revolves the hammerv will be forced up against the tension of the spring 22; but immediately after either bearing-face of the cam passes from engagement with the hammer .stud or pin 21 the spring 22 will be 65 free to act toforce the ham mer hard against the plug 19. As each blow is struck the plug and the drill carried thereby will be turned forward one step, owing to the engagement of one of the pins d with the crown-wheel 25.

It is desirable that provision. be made for stopping the action of the drill without stopping the motor, and to that end I provide the hamm er with a pin 27, which extends through the case, there to be engaged by a latch 28, that is pivotally connected to the case, as shown in the drawings, the arrangement being such that the latch may be turned to engage the pin 27 and hold the hammer-pin 21- out of the path of the cam 13.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A drill comprising a tubular casing, a plug having longitudinal and axial movement therein and providedbetween its ends W1th an annular crown-wheel, a drill-rod passing through and iixedly secured to said plug, -`a hammer sliding on the drill-rod above the lplug to strike its upper end and provided 9o with a lateral projection, a spring encircling the said rod between the top of the casin g and upper -end of the hammer, and a verticallyrotating cam mounted in one side of the casing under the hammer projection and provided on its inner side parallel with its axis With spurs or teeth to mesh with the teeth of the crown-wheel and rotate the plug and drillrod at intervals, substantially as set forth.

2. A drill comprising a longitudinally-slot roo ted tubular casing, the sliding hammer provided With lateral proj ect-ions extending through the slot beyond the outer face of the casing, a latch pivoted on the outer side of the casing and having a shoulder to pass under one of the said project/ions and hold the hammer raised, a drill-rod passing loosely through the hammer, a spiral spring bearing 011 the upper end of the hammer, a plug ixedly secured to the drill-rod below the hammer, and a vertical cam engaging the other hammer projection to raise and release the hammer, substantially as set forth.

The combination, with the tubular casingl having a side opening, a bracket on the outer sideof the casing over the said opening, and a transverse shaft; journaled in said bracket and having a vertieally-rotatin g cam on its inner end Within thev bracket and provided on its inner face with spurs or teeth parallel with said shaft, of a drill-rod passing through the easing, a plug fixedly secured on the rod and having longitudinal aud axial movement in the lower end of the casing, an annular crown-wheel around the plug near its upper end in the path of said teeth or spurs, a hammer Within the casing, having a longitudinal bore through which the drill-rod loosely passes, and a lateral proj ect-ien inthe path of the cam, and a spiral spring bearing on the upper end of the hammer, substanti ally as set forth. p

MARQUIS D. L. WINDELL Vitnesses:

CHARLES H. GINKINS, I'IENRY C. HAYS. 

